<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
	<title>Insert title here</title>
	<style type="text/css">
	/*通过选择器选择元素*/
	h2{
		color:green;
	}
	</style>
	<link rel="stylesheet" href="demo01.css">
	</head>
	<body align="center">
		<h1 style="color:red">改革春风吹满地,中国人民真争气</h1>
		<h2>白日依山尽</h2>
		<h2>黄河入海流</h2>
		<h2>欲穷千里目</h2>
		<h2>更上一层楼</h2>
		<h3>锄禾日当午</h3>
		<h3>汗滴禾下土</h3>
	</body>
</html>